The Obama administration will not allow Iran access to the financial system of the United States nor the use of dollars in transactions.

Thomas Shannon, the US Under Secretary for Political Affairs, said the United States could use its veto power in the UN Security Council to block any sale of Russian jet fighter planes Su-30 to Iran, Reuters news agency.

"We will block the approval of fighter aircraft," said Shannon Committee on Foreign Relations, US Senate, pointing to such sale had to be approved by the Security Council.

He also told lawmakers worried that the administration of President of the United States Barack Obama does not plan to allow Iran to have access to the US financial system nor the use of the US dollar for transactions.

"Rumors and news that have appeared in the media are not true," he said during the hearing in the Committee.

dollar transactions

When Republican Senator Bob Corker, chairman of the Committee, asked whether such statements are "false," Shannon replied: "At this point, the answer is yes."

US lawmakers, mostly Republicans but also some Democrats of Obama, have expressed deep concern in recent days amid allegations that the US administration could allow Iran to use dollars in some business transactions.